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PORails.cache.fetch exception: TypeError (<ModelName> can't be referred to)
 

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  1. PORails.cache.fetch exception: TypeError (<ModelName> can't be referred to)
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    <p>I'm implementing some caching by using the nifty <code>Rails.cache.fetch</code>. However, in one particular instance, sometimes I encounter an exception:</p> <pre class="lang-none prettyprint-override"><code>TypeError in EmloController#index Emlo can't be referred to app/controllers/emlo_controller.rb:320:in `get_employees' app/controllers/emlo_controller.rb:356:in `prepare_json_response' app/controllers/emlo_controller.rb:23:in `block (2 levels) in index' app/controllers/emlo_controller.rb:15:in `index' </code></pre> <p>It seems the fetch will always explode (with the above) on the first try, and then work fine as long as the fetch is within the expiration. I know I'm missing something, so a fresh pair of eyes would be nice.</p> <p>Here's the method which invokes the cache fetch:</p> <pre class="lang-ruby prettyprint-override"><code>def get_employees # This is for a AJAX refresh loop, so a 5-second cache actually helps quite a bit Rails.cache.fetch('emlo_all', :expires_in =&gt; 5.seconds, :race_condition_ttl =&gt; 1) do conditions = (params[:id]) ? {:user_id =&gt; params[:id]} : nil selections = [ 'employee_locations.id AS emlo_id', 'employee_locations.status_id', 'employee_locations.notes', 'employee_locations.until', 'employee_locations.updated_at', 'employee_locations.user_id', 'location_states.id AS state_id', 'location_states.title AS status_string', 'location_states.font_color', 'location_states.bg_color', 'users.displayname', 'users.email', 'users.mobile', 'users.department', 'users.extension', 'users.guid', 'users.dn' ].join(', ') Emlo.all( :select =&gt; selections, :joins =&gt; 'LEFT JOIN users ON employee_locations.user_id=users.id LEFT JOIN location_states ON employee_locations.status_id=location_states.id', :conditions =&gt; conditions, :order =&gt; 'users.displayname ASC' ) end end </code></pre>
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    1. USMatthew Clark
    1. USMatthew Clark
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    1. COWell, for now, I've decided to just perform a `caches_action` on the action which ultimately calls this method. Seems to work fine for now, but I'm still interested in learning what someone else might have to say about the exception I experienced.
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      1. PORails.cache.fetch exception: TypeError (<ModelName> can't be referred to)
      1. USMatthew Clark
    2. COI just ran into this again, only this time with `Rails.cache.write()` and `.read()`: "`TypeError (<ModelName> can't be referred to)`"
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      1. PORails.cache.fetch exception: TypeError (<ModelName> can't be referred to)
      1. USMatthew Clark
    3. COSounds like you need to force the Emlo class to be loaded or else rails doesn't know how to deserialize what's in memcache.
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      1. PORails.cache.fetch exception: TypeError (<ModelName> can't be referred to)
      1. USFrederick Cheung
 

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